When two pistons are powered diagonally, both pistons stacked on top of eachother, the piston heads glitch out causing some weird graphical glitch.
If this description isn't clear enough please watch: http://youtu.be/2DvlBdPpoHY?t=56s
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Duplicate of MC-8198, please use the search function to see if your bug has already been submitted. Currently over 50% of tickets are being closed as duplicate.